NAME

std::chrono::year_month_weekday::operatorsys_days, - std::chrono::year_month_weekday::operatorsys_days,

Synopsis

constexpr operator std::chrono::sys_days() const noexcept; (1) (since C++20)
explicit constexpr operator std::chrono::local_days() const (2) (since C++20)
noexcept;

Converts *this to a std::chrono::time_point representing the same date as this
year_month_weekday.

1) If year().ok() && month().ok() && weekday().ok():

* If index() == 0, returns a sys_days that represents the date 7 days
prior to the first weekday() of the year and month.
* Else, returns a sys_days that represents the date (index() - 1) * 7
days after the first weekday() of the year and month.

Otherwise, the returned value is unspecified.
2) Same as (1), but returns local_days instead of sys_days. Equivalent to
local_days(sys_days(*this).time_since_epoch()).

Example

// Run this code

#include <iostream>
#include <chrono>
using namespace std::chrono;

int main()
{
std::cout << std::boolalpha;

constexpr auto ymwd {Tuesday[2]/11/2021};
// convert from field-based to serial-based to add hours
constexpr auto sd = sys_days{ymwd} + 24h;
constexpr auto ymd = floor<days>(sd);
std::cout << (ymd == November/10/2021) << '\n';
}

Output:

true